I like to study and read about physics in my spare time. One thing that has always puzled me is how the scientists, particulary physicists and mathematicians can come up with a mathmatical equation for an event in nature.One thing I've tried to study to get a better understanding is the Lorenzt Transformation equation. I dont understand when to use division or multiplication,square roots or some more advanced mathmatics like calc plus anything past calc. I took up to calculus in college, but I am still baffled as how it would be used to model or explain a real world event. 1. are there any finite rules for when to use a particular type of mathmatics, or when to use one type with another? for example, how would I know when to use a square root or division ECT ?